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Coroutines Test 入門 / Android Test Night #8
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star_zero
March 10, 2023
Programming
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Coroutines Test 入門 / Android Test Night #8
star_zero
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Transcript
Android Test Night #8 2023/03/10 Coroutines Test 入門
• Kenji Abe • @STAR_ZERO • Google Developers Expert for
Android, Kotlin • DeNA Co., Ltd.
// build.gradle dependencies { // ... testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.6.4") }
supsend関数のテスト
class Sample { suspend fun run(): String { return "hoge"
} }
class SampleTest { @Test fun testRun() = runTest { val
sample = Sample() val result = sample.run() assert(result == "hoge") } }
class SampleTest { @Test fun testRun() = runTest { val
sample = Sample() val result = sample.run() assert(result == "hoge") } }
• runBlockingのようなもの • delay関数はすべてスキップされる ◦ Vertial Timeを制御することができる • TestScopeが使用される runTest
TestDispatchers
• StandardTestDispatcher ◦ runTestデフォルト ◦ TestCoroutineSchedulerを使用するシンプルなDispatcher • UnconfinedTestDispatcher ◦ Dispatchers.Unconfinedのようなもの
◦ トップレベルのlaunch/asyncがすぐに実行される TestDispatchers
class SampleTest { @Test fun testRun() = runTest { val
sample = Sample() val result = sample.run() assert(result == "hoge") } }
@Test fun test() = runTest { var result = 0
launch { result = 1 } assert(result == 1) }
@Test fun test() = runTest { var result = 0
launch { result = 1 } assert(result == 1) } ❌ Failed
@Test fun test() = runTest { var result = 0
launch { result = 1 } assert(result == 1) } ① ② ③
@Test fun test() = runTest { var result = 0
launch { result = 1 } runCurrent() assert(result == 1) } ✅ Success
@Test fun test() = runTest { var result = 0
launch { result = 1 } runCurrent() assert(result == 1) } ① ② ③ ④
@Test fun test() = runTest { var result = 0
launch { delay(1000) result = 1 } runCurrent() assert(result == 1) }
@Test fun test() = runTest { var result = 0
launch { delay(1000) result = 1 } runCurrent() assert(result == 1) } ❌ Failed
@Test fun test() = runTest { var result = 0
launch { delay(1000) result = 1 } runCurrent() assert(result == 1) } ① ② ③ ④ ⑤
@Test fun test() = runTest { // ... advanceUntilIdle() //
または advanceTimeBy(1001) assert(result == 1) } ✅ Success
@Test fun test() = runTest(UnconfinedTestDispatcher()) { var result = 0
launch { result = 1 } assert(result == 1) }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { var result = 0
launch { result = 1 } assert(result == 1) } ✅ Success
Mainスレッド対応
class Sample { suspend fun run(): String = withContext(Dispatchers.Main) {
"hoge" } }
@Test fun testRun() = runTest { val sample = Sample()
val result = sample.run() assert(result == "hoge") }
@Test fun testRun() = runTest { val sample = Sample()
val result = sample.run() assert(result == "hoge") }
@Before fun setUp() { Dispatchers.setMain(StandardTestDispatcher()) } @After fun tearDown() {
Dispatchers.resetMain() }
Flowのテスト
class Sample { val flow = MutableSharedFlow<Int>() suspend fun emit(value:
Int) { flow.emit(value) } }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { val sample = Sample()
val result = mutableListOf<Int>() val job = launch { sample.flow.toCollection(result) } assert(result.size == 0) sample.emit(1) assert(result.size == 1) assert(result.first() == 1) job.cancel() }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { val sample = Sample()
val result = mutableListOf<Int>() // ... }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { val sample = Sample()
val result = mutableListOf<Int>() val job = launch { sample.flow.toCollection(result) } // ... }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { val sample = Sample()
val result = mutableListOf<Int>() val job = launch { sample.flow.toCollection(result) } // ... }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { // ... val job
= launch { sample.flow.toCollection(result) } assert(result.size == 0) // ... }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { // ... val job
= launch { sample.flow.toCollection(result) } sample.emit(1) // ... }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { // ... sample.emit(1) assert(result.size
== 1) assert(result.first() == 1) job.cancel() }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { // ... val job
= launch { sample.flow.toCollection(result) } // ... job.cancel() }
@Test fun test() = runTest(UnconfinedTestDispatcher()) { // ... backgroundScope.launch {
sample.flow.toCollection(result) } // ... // job.cancel() }
Turbine (時間の都合上省略...) https://github.com/cashapp/turbine
まとめ
• runTest • StandardTestDispatcher / UnconfinedTestDispatcher • Dispatchers.setMain • backgroundScope
まとめ
ありがとうございました